Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Jun. 18, 2018	May 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Environmental Loss Contingencies [Line Items]
Environmental contingency accrual			$ 54	$ 49
Minimum [Member]
Environmental Loss Contingencies [Line Items]
Reasonably possible additional loss - Environmental			65
Maximum [Member]
Environmental Loss Contingencies [Line Items]
Reasonably possible additional loss - Environmental			$ 130
PolyOne [Member] | Pending Litigation [Member]
Environmental Loss Contingencies [Line Items]
Gain Contingency, Unrecorded Amount			100.00%
Loss Contingency, Damages Sought, Value		$ 10
Environmental Protection Agency [Member] | Operation and Maintenance [Member]
Environmental Loss Contingencies [Line Items]
Environmental Remediation Expense	$ 107
Environmental Protection Agency [Member] | Operation and Maintenance [Member] | Minimum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost			$ 1
Environmental Protection Agency [Member] | Operation and Maintenance [Member] | Maximum [Member]
Environmental Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost			$ 3